https://scholars.lib.ntu.edu.tw/handle/123456789/432805
Title: | Highly active and stable hybrid catalyst of cobalt-doped FeS2 nanosheets-carbon nanotubes for hydrogen evolution reaction | Authors: | Wang D.-Y. Gong M. Chou H.-L. Pan C.-J. Chen H.-A. Wu Y. Lin M.-C. Guan M. Yang J. Chen C.-W. Wang Y.-L. Hwang B.-J. Chen C.-C. Dai H. CHUN-WEI CHEN |
Issue Date: | 2015 | Publisher: | American Chemical Society | Journal Volume: | 137 | Journal Issue: | 4 | Start page/Pages: | 1587-1592 | Source: | Journal of the American Chemical Society | Abstract: | Hydrogen evolution reaction (HER) from water through electrocatalysis using cost-effective materials to replace precious Pt catalysts holds great promise for clean energy technologies. In this work we developed a highly active and stable catalyst containing Co doped earth abundant iron pyrite FeS2 nanosheets hybridized with carbon nanotubes (Fe1-xCoxS2/CNT hybrid catalysts) for HER in acidic solutions. The pyrite phase of Fe1-xCoxS2/CNT was characterized by powder X-ray diffraction and absorption spectroscopy. Electrochemical measurements showed a low overpotential of ∼0.12 V at 20 mA/cm2, small Tafel slope of ∼46 mV/decade, and long-term durability over 40 h of HER operation using bulk quantities of Fe0.9Co0.1S2/CNT hybrid catalysts at high loadings (∼7 mg/cm2). Density functional theory calculation revealed that the origin of high catalytic activity stemmed from a large reduction of the kinetic energy barrier of H atom adsorption on FeS2 surface upon Co doping in the iron pyrite structure. It is also found that the high HER catalytic activity of Fe0.9Co0.1S2 hinges on the hybridization with CNTs to impart strong heteroatomic interactions between CNT and Fe0.9Co0.1S2. This work produces the most active HER catalyst based on iron pyrite, suggesting a scalable, low cost, and highly efficient catalyst for hydrogen generation. © 2015 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84922364334&doi=10.1021%2fja511572q&partnerID=40&md5=4ba28ab5349274320395af66a02fca07 https://scholars.lib.ntu.edu.tw/handle/123456789/432805 |
ISSN: | 00027863 | DOI: | 10.1021/ja511572q | SDG/Keyword: | Absorption spectroscopy; Carbon nanotubes; Cobalt; Cost effectiveness; Density functional theory; Electrocatalysis; Hydrogen production; Iron; Kinetic energy; Kinetics; Nanosheets; Pyrites; Acidic solutions; Clean energy technology; Efficient catalysts; Electrochemical measurements; Hydrogen evolution reactions; Hydrogen generations; Long term durability; Powder X ray diffraction; Catalyst activity; carbon; carbon nanotube; cobalt; graphene oxide; hydrogen; inorganic salt; iron pyrite; nanocrystal; pyrite; unclassified drug; absorption spectroscopy; adsorption; Article; chemical reaction; crystal structure; cyclic potentiometry; density functional theory; electric conductivity; electrochemistry; hybridization; hydrogen bond; hydrogen evolution; nanocatalyst; phase separation; polarization; scanning electron microscopy; surface property; synthesis; transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy |
Appears in Collections: | 材料科學與工程學系 |
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